CouponMountain - add <merchant> coupon search plugin

Plugin functionality : (Help user to find online coupon codes)
Plugin data source (API) : (http://www.couponmountain.com/plugin/searchEngine.html)
Reason for API selection : (It's the only API to return coupon codes by search keyword)
Example queries : (HP coupon code, Dell promo code, laptop coupon codes)
Plugin Audience : (All consumers)
Have you done any cross-browser testing? (Yes)